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Helped a buddy build a cannon. 4140 bar bored to 1-11/16", about 28" long. It's mounted to a naval style carriage with screw elevation and traverse. Ignition uses a spring loaded hammer (rope actuated) and shotgun primers. The blast out the touch-hole re-cocks the hammer!
The bore was picked to shoot golf balls. we also made a mold to cast 1# lead balls - it's a one gage.
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